Giải Vở bài tập Toán 3 bài 160: Ôn tập bốn phép tính trong phạm vi 100 000 (tiếp theo)

Thứ năm - 29/08/2019 13:00
Giải Vở bài tập Toán 3 bài 160: Ôn tập bốn phép tính trong phạm vi 100 000 (tiếp theo)
1. Tính nhẩm:
a) 30000 + (20000 + 40000) = 90000
    30000 + 20000 + 40000 = 90000
    60000 - (30000 + 20000) = 10000
    60000 - 30000 - 20000 = 10000

b) 40000 x 2 : 4 = 20000
    36000 : 6 x 3 = 18000
    20000 x 4 : 8 = 10000
    60000 : 3 : 2 = 10000

2. Đặt tính rồi tính:
giai VBt toan lop 3 bai 160 cau 2
3. Tìm X:
a) 1996 + x = 2002      
                 x = 2002 – 1996
                 x = 6
b) x 3 = 9861
           x = 9861 : 3
           x = 3287
c) x : 4 = 250
        x = 250 x 4
        x = 1000

3. Mua 5 bóng đèn phải trả 42 500 đồng. 1101 mua 8 bóng đèn như thế phải trả bao nhiêu tiền?
Tóm tắt:
5 bóng đèn: 42 500 đồng
8 bóng đèn: đồng ?
Giải:
Một bóng đèn hết số tiền là:
42 500 : 5 = 8500 (đồng)
Tám bóng hết số tiền là:
8500 x 8 = 68000 (đồng)
Đáp số: 68000 đồng.
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